Analysis On Underpinning Under Horizontal Load In Building Moving Engineering

With the development of modern city in recent years, both the number and the scale of building movement engineering have increased to a great extent. Building moving technology has the high social efficiency and economic efficiency. It not only can satisfy the urban planning and the environmental protection need, but also can save the massive construction funds and the removal expense, and it can significantly shorten the duration, reduce the contradictions of demolition, and effectively protect the historical buildings that are of important cultural value.The building moving is to move an existing building from former site to a new one, keeping the integrity of construction and usability invariable, which includes vertical and horizontal movement and rotation. Structural underpinning is one of the key links for monolithic moving technology, and the underpinning of building directly affects the stability and security of the building moving, and it is the key to success for moving.Underpinning technology had been studied a lot in building strengthening and retrofitting, and many underpinning methods had been introduced, but most of the methods were specific to foundation underpinning, there were few methods for underpinning in building moving engineering. There has been no system study on underpinning by now, and especially the study on the underpinning under horizontal load has not been involved in. In this paper, the deformation of underpinning under horizontal load was analyzed by using finite element method firstly, and special emphasis was laid on the research of underpinning technology and its application on building moving engineering. The main contents are as follows.1 Theoretical analysis and finite element calculation have been made on the column underpinning joint, and the calculation results were in good agreement with the engineering practice.2 Three representative engineering were summarized from the view of structural engineers, and the key techniques about the protection of different historic buildings, including moving technique, underpinning technique and how to improve the earthquake behaviors were introduced.3 Combined with the moving of a building, which was fifteen-story high and frame-shear wall structure in high-tech zone of Laiwu city, the design method of underpinning joints under columns and the behaviors of underpinning under horizontal load were studied systemically through the analysis by ANSYS and Sap2000. The determinations of the underpinning structure and the walking mechanism during moving process, the application form of moving power, and the monitoring contents and method were introduced in this paper. The moving design and the application form of moving power principles were also put foreword for the project is especially long in the longitudinal direction.