Considering the professional features of steel connection-joint design, this paper developed a new computer-aided design (CAD) program which is aiming at solving problems that the connection-joint design results unsuitable for human intervention of the software developed by our country. Program developing and researching is adopted the object-oriented development technique C++ to provide a flexible interactive function which can not only achieve the whole building's automatic connection-joint design of three-dimensional framework but also nodes merging, node design results modification and re-checking by designer. The program can make the connection-joint design of framework fast, simple and accurate to improve engineering efficiency. The achievement has been used in each module of the PKPM series steel structure design software as base class library of steel connection design in dynamic library plug-in form and obtained good application effects.

Considering the large amount of prefabricated PC component and the high frequency of distribution, the transportation cost of the prefabricated PC component becomes one of the main factors affecting the cost composition of PC components. This paper researches on the traditional vehicle scheduling problem, particle swarm optimization algorithm and transportation influence factors, and establishes the transportation cost model of PC component based on vehicle fuel consumption and vehicle rental and artificial cost. Using precise algorithm is able to calculate the optimal solution but time-consuming, and traditional particle swarm optimization algorithm has some defects. So, with the improved particle swarm optimization algorithm and accurate algorithm for an instance, vehicle scheduling scheme is obtained under two ways and comprehensive optimal cost is the same, which proves the correctness and effectiveness of the improved particle swarm algorithm that provides a good method to solve such problem.

Based on the current application of forward design in China′s design institutes, from the perspective of design institutes, and based on the forward design process of three super high-rise building engineering cases with different functions, this paper discusses the application of BIM technology in forward design in construction drawing design stage. The standard problem of model establishment, accuracy problem, control problem of model quality, and the application points of BIM technology in architecture are discussed. The application process of BIM forward design in architecture is summarized in order to provide reference for similar projects.

In this paper, an improved Floyd algorithm is proposed, based on Gauss-Seidel iteration thought and detailed analysis of the characteristics of industrial railway network.The improved Floyd algorithm successfully solved the key issue of the simulation optimization software, which is used to the industrial railway transportation.Using of Seidel iteration thought, the algorithm's iteration number is decreased from n to two, which effectively reduced the computational complexity.At the same time, it is a very good solution to the problem of railway angular, because of the using of the railway angular algorithm.

There are large number of ancient buildings in China, whose information archive is an important content in the protection of ancient buildings.The establishment of ancient building component information database based on BIM can be more efficient and effective to preserve ancient information.The reasonable standardization of component information is the basic of the information database can efficiently build.This paper studied the standardization of ancient building component information and the method for quantitative extraction of the key information, then to facilitated information reuse and the establishment of corresponding functions, improved the efficiency and function of ancient component information database.